I’m still in my 20s, but as of a few years ago I started forgetting what’s my exact age. I always have to stop and recalculate it each time someone asks me. I get asked fairly infrequently, but when I do it’s a bit weird/embarrassing that I have to say “wait, let me calculate”. (I know when I was born, of course.)
It seems as if there’s no good reason I’d remember it, since it changes all the time and it is rarely mentioned in practice. But others, including people much older than myself, know their own age immediately.
I’m also terrible at remembering people’s names, I don’t know if that could be related?
No it’s not weird, it happened to me at times. It’s good that you’re not thinking about your age so much that it’s so familiar if that makes sense. I don’t make a big deal of birthdays and my age isn’t a big deal to me.
You’ll likely remember better in those years when you hit a 0 though.
People may misunderstand what you’re saying too. For me it’d be “wait am I 27 or 28 this year?” And have to do a quick calculation. Not “I can’t remember how old I am at all”.